The Atlas of Canada has an extensive collective of current and historical maps available for viewing on line. As well as providing online maps on population, economic activity, environment and political features as part of its latest version, the Atlas also provides raster images of the 5 previous paper versions, dating back to 1906. Each Atlas gives a snapshot of what the country looked like at the time of publication as well as the changing cartographic styles. Certainly worthy of look, particular if you are in need of historical maps. Available in both French and English.